/Engine/Plugins/FX/Niagara/Source/NiagaraEditor/Public/ViewModels/NiagaraSystemViewModel.h
Gets the ViewModel for the system overview graph.
[TSharedPtr](API\Runtime\Core\Templates\TSharedPtr)< [FNiagaraOverviewGraphViewModel](API\Plugins\NiagaraEditor\ViewModels\FNiagaraOverviewGraphViewModel) > GetOverviewGraphViewModel() const